Random troubleshooting leads to wasted hours. A structured approach saves time and catches problems others miss.
The scientific method for networks:
Identify the problem. What exactly is not working? Get specific symptoms.
Establish a theory. What could cause these symptoms?
Test the theory. Run diagnostics to confirm or eliminate your theory.
Implement the solution. Make the change carefully.
Verify full functionality. Does everything work?
Document findings. What happened and how did you fix it?
Following this process prevents you from jumping to conclusions.